Air-cooled-engine cylinder



Nov. 16 1926.

J. M. HEINRICH AIR cooLED ENGINE CYLINDER Filed Nov. 25, 1924 2Sheets-Sheet l Nov. 16 1926. 1,607,346

J. M. HEINRICH AIR COOLED ENGINE CYLINDER Filed Nov. 25, 1924 2Sheets-Sheet 2 Patented Nov. 16, 192.6.

UNITED STATES` L 1,607,346- PATENT oFFIcE.

JEAN MARIE HEINRICH, 0F PARIS, FRANCE, ASSIGNOB TO SOCIT DES MOTEURSSALMSON (SYSTME CANTON-UNN), 0F EAI-LIS, FRANCE.

AIR-COQIIED-ENGHVE CYlLINDER.

Application ledNovember 25, 1924, Serial No. 752,220, and in FranceJanuary 4, 1924.

The present invention has for its object an improved air-'cooledcylinder for inte/rnal combustion engines.

According to the invention, the englne cylinder comprises a jacket whichis made of a light and good heat-conducting metal and is provided withair cooling ribs, said jacket being separately secured to or preferablcast upon the cylinder properly so calle The jacket may be connected tothe latter by all suitable mechanical means, and one important featureof the Ainvention 1s that it can be used with cylinders which havealready been constructed in view of other methods of cooling.

Other features of the invention will be set forth in the followingdescription with reference to the appended drawings which are given byway of example and wherein:

F 1 is averticalV sectionfon the line C-C/g (Fig. 2) of an air-cooledcylinder for internal combustion engines, according to M the invention.

Fig. 2 is a corresponding plan view.

Fi 3 is a half section of the explosion cham er of the cylinder, on theline A-B of Fig. 2, and

Fig. 4 is a half section of the said chamber on the line B-C of Fig. 2.l

Figs. 3 and 4 show modifications of the means connecting the cylinderand the jacket.

1 is the cylinder properly so called which is made of a strongmetal,such as` steel or cast iron, and worked in the usual manner, saidcylinder 'comprising (preferabl integral with the cylindrical body 2) te cylinder head 3, the inlets 4 and outlets with their respective valveseatings 6 and 7 and valve guldes 8 and 9, the ignition aperture 10 orthe aperture 11 for compression cock, and the bearing parts 12 forsecuring the valve levers, and like parts. `The cylinder head and themajor part of the cylindrical body 2 are surrounded by a radiatingjacket 13 which is made of a metal which is good conductor of heat and-is preferably of a light nature, particularly for the cylinders ofaeroplane engines; the said metal may be for instance an alloy ofaluminum. The jacket 13 is formed with cooling ribs 14 which are ofsuitable size and shape to offer a lar e surface of contact with thecurrent of'coo 'ng air and an efficient radiation of heat.

,ner surface of the cylinder.

The said jacket 13 may consist of a number of pieces which aremechanically fitted upon the cylinder 1, but the drawings show a jacketwhich is cast around. the said cylinder, the casting operation beingperformed with greater facility than the adjustment of a jacket made inseveral parts, and the casting also affords a betterl adhesion of themetal of the jacket to the metal of the cylinder, so that the heatproduced in the cylinder is conducted to thel exterior in a moreeffective manner.

Since the said jacket consists of a metal havin relatively vbut littlestrength, it is not a apted to withstand heavy mechanical stresses forany length-of time, its function being limited in principle to theradiation of the heat. Means must therefore be provided to secure theproper connection between the said jacket and cylinder l, at the sametime affording a good contact between the metals for the transmission ofheat. When the said jacket is to be cast upon the cylinder,Y as hereinrepresented, grooves 15 maybe provided upon the cylinder body 2, beforecasting, said grooves being longitudinal, helical or simply circular;said grooves are also shallow in order that the strength of the cylinder1 shall not be diminished,

Ybut they may have a close spacing without inconvenience. Suitable rings16 of strong metal are preferably imbedded in the lcooling ribs duringthe casting in order to secure a tight fitting upon the cylinder andtoprovide for a good maintenance for the jacket. Should the wall of thecylinder 1 have a suilicient thickness, one may turn therein suitablebosses, such as the knob 17 which is formed on the cylinder head 3, inorder to hold the metals together. On the thinner pgrts of the cylinderwall separately secured obs 18, screwed or riveted to the said wall, maybe provided and serve the same purpose as the knobs 17.

Fig. 3 shows another method of connecting the said cylinder and jacket.When the jacket has been cast upon the cylinder, holes are formedthrough the double wall thus obtained and rivets 19 are inserted throughsaid holes and are countersunk upon the in- The said rivets may be madeof a good conducting metal,

and they will be more effective in withdrawof the said jacket, eventhough comparatively weak, be suicientl malleable (which condition maybe readi y obtained) holes may be made, before the casting operation, inthe wall of the cylinder, so that the metal of the jacket will form thenibs 20, Fig. 4, these bein pounded down upon the interior of the cyinder after the manner of rivets in order to secure a tight fit. Therivets 19 and the nibs 20 will constitute I,auxiliary heat-withdrawingmeans, these being disposed to advantage at the hottest points on thecylinder.

The saidjacket, whether applied in separate parts or cast inA one piece,may be placed upon an already constructed cylinder which hasbeenpreliminarily designed for use with aV water jacket, and in such case itis simply necessary to remove the said jacket and (in the case of a castjacket) to take the necessary dispositions for obtaining suitableconnecting means between the metals of the cylinder and the jacket 13.The slight ad dition in the mechanical strength which is afforded by thesaid jacket allows of forming grooves, rivet, holes, tappet holes,connecting knobs, or the like, upon the cylinder itself withoutdiminishing the totalstrength of the cylinder. For cylinders arrangedand machine-treated for use with a water jacket, the flange 21 whichserves to secure the water 'jacket and is integral with the cylinder(Fig. 1) will constitute an additional element by which the lower partof thejacket 13 is connected to the cylinder.

l But for a specially-designed type of cylinder which is to be. employedwith the jacket according tothe invention, the ar'- rangement will befacilitated inasmuch as the draftsman will now have the choice of' ingiven solely by way of example, and in p particular, all suitable meansof connection between the cylinder properly so called and the radiatingjacket may be employed without departing from the spirit of theinvention.

Having now described my invention, what I claim as new and desire tosecure by Letters' Patent is:

1. An engine cylinder comprising in combination a cylinder core, anouter coating of a good heat-conducting metal cast upon said cylindercore and rivets for connecting said cylindercore to said coating.

2. An engine cylinder comprising in co1n bination a cylinder core, anouter coating of a good heat-conducting metal cast upon said cylindercore and rivets for connecting said cylinder core to said coating andbeing also of a good heat conducting metal, and disposed at the pointsof the cylinder which are at the highest temperatures when the engine isworking.

3. An engine cylinder comprising in com,- bination a cylinder core, anouter coating of a good heat-conducting metal vcast upon 'said cylindercore and flush rivets for connecting said cylinder core t0 said coating.

In testimony whereof I have signed my name to this specification.

v JEAN MARIE HEINRICH.

